YOU SAID:
I lost my dog to the flying bird
INTO JAPANESE
飛んでいる鳥に愛犬を亡くしました
BACK INTO ENGLISH
I lost my dog to a flying bird.
INTO JAPANESE
私は飛んでいた鳥によって愛犬を失いました。
BACK INTO ENGLISH
I lost my dog to a flying bird.
That didn't even make that much sense in English.